
1. Poor Planning & Layout
- Ignoring traffic flow, door swing, or shower clearance.
- Cramming in fixtures without considering comfort and usability.
- Forgetting storage space for toiletries, towels, and cleaning supplies.
Why it’s a problem: Bad layouts can make even a stylish bathroom feel cramped and awkward.
2. Underestimating the Budget

- Not accounting for hidden issues like water damage, mold, or plumbing upgrades.
- Choosing finishes and fixtures without factoring in labor costs.
- Forgetting about permits and inspection fees.
Tip: Add 10–20% contingency for unexpected costs.
3. Skipping Waterproofing Details
- Not installing proper membranes in showers and wet zones.
- Using drywall instead of cement board in moisture-prone areas.
- Ignoring sealants around sinks, tubs, and floors.
Result: Water damage, mold growth, and costly repairs.
4. Overlooking Ventilation

- Forgetting an exhaust fan or installing one with inadequate capacity.
- Not venting it outdoors (some vent into the attic by mistake).
Why it matters: Moisture buildup leads to mold, peeling paint, and unpleasant odors.
5. Choosing Style Over Function
- Picking materials that look great but aren’t water-resistant or easy to clean.
- Using slippery floor tiles with no slip-resistance.
- Installing open shelving in high-moisture areas without protection.
6. DIY Plumbing or Electrical Without Knowledge
- Cutting corners by doing complex work without proper skills.
- Creating code violations that could cause leaks, shocks, or fire hazards.
Better approach: Hire licensed tradespeople for technical work.
7. Inadequate Lighting

- Relying only on a ceiling fixture without task lighting at the vanity.
- Ignoring natural light opportunities.
Impact: Shadows on your face, dim ambiance, and a less inviting space.
8. Wrong Fixture Placement
- Installing the toilet too close to walls or vanities.
- Positioning the shower head where it sprays outside the enclosure.
- Placing mirrors too high or low.
9. Not Planning for Storage
- Forgetting recessed niches in the shower.
- No built-in cabinets or vanity drawers.
- Over-relying on countertop space.
10. Overpersonalizing the Design
- Choosing bold colors or ultra-trendy fixtures that date quickly.
- Making it so unique it turns off future buyers.
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